127
Failure code
Outdoor
digital
display tube:
114-0, 1
Indoor wired
controller:
72
Indoor unit LED status
LED5 Failure description:
Compressor module DC BUS under voltage
20 times
Outdoor unit LED status
LED1L ED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the power
voltage is too low and results
in voltage decrease after
◆
Check if the PTC is in
normal conditions ;
◆
Check if the cabinet is
correctly wired .
conditions
Raise failure alarm when
power voltage<DC420V.
INV control board recovers
automatically when voltage
>DC420V
4. Possible causes
◆
Incorrect wiring may result
in under voltage alarm;
◆
PTC or relay damage may
result in under voltage;
◆
Low power voltage may
result in under voltage.
Check i f the supply voltage i s normal
and the cabinet is wired correctly.
Check i f the power relay and
PTC is contacted.
Test i f the voltage o f DC b us i s
below 420V.
Replace and c ompare the
neighboring electrical cabinet
by troubleshooting.
Adjust o r replace the power
relay.
The detection circuit of variable
frequency board i s damaged,
replace the board.
Adjust t he supply voltage or
rewire the cabinet in accordance
with circuit diagram.
Y
Y
Y
N
N
N
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